1 /* This file contains the definitions and documentation for the
2 Register Transfer Expressions (rtx's) that make up the
3 Register Transfer Language (rtl) used in the Back End of the GNU compiler.
4 Copyright (C) 1987, 1988, 1992, 1994, 1995, 1997, 1998, 1999, 2000, 2004,
5 2005, 2006, 2007, 2008, 2009, 2010, 2011
6 Free Software Foundation, Inc.
8 This file is part of GCC.
10 GCC is free software; you can redistribute it and/or modify it under
11 the terms of the GNU General Public License as published by the Free
12 Software Foundation; either version 3, or (at your option) any later
15 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
16 WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 You should have received a copy of the GNU General Public License
21 along with GCC; see the file COPYING3. If not see
22 <http://www.gnu.org/licenses/>. */
25 /* Expression definitions and descriptions for all targets are in this file.
26 Some will not be used for some targets.
28 The fields in the cpp macro call "DEF_RTL_EXPR()"
29 are used to create declarations in the C source of the compiler.
33 1. The internal name of the rtx used in the C source.
34 It is a tag in the enumeration "enum rtx_code" defined in "rtl.h".
35 By convention these are in UPPER_CASE.
37 2. The name of the rtx in the external ASCII format read by
38 read_rtx(), and printed by print_rtx().
39 These names are stored in rtx_name[].
40 By convention these are the internal (field 1) names in lower_case.
42 3. The print format, and type of each rtx->u.fld[] (field) in this rtx.
43 These formats are stored in rtx_format[].
44 The meaning of the formats is documented in front of this array in rtl.c
46 4. The class of the rtx. These are stored in rtx_class and are accessed
47 via the GET_RTX_CLASS macro. They are defined as follows:
50 an rtx code that can be used to represent a constant object
53 an rtx code that can be used to represent an object (e.g, REG, MEM)
55 an rtx code for a comparison (e.g, LT, GT)
57 an rtx code for a commutative comparison (e.g, EQ, NE, ORDERED)
59 an rtx code for a unary arithmetic expression (e.g, NEG, NOT)
61 an rtx code for a commutative binary operation (e.g,, PLUS, MULT)
63 an rtx code for a non-bitfield three input operation (IF_THEN_ELSE)
65 an rtx code for a non-commutative binary operation (e.g., MINUS, DIV)
67 an rtx code for a bit-field operation (ZERO_EXTRACT, SIGN_EXTRACT)
69 an rtx code for a machine insn (INSN, JUMP_INSN, CALL_INSN)
71 an rtx code for something that matches in insns (e.g, MATCH_DUP)
73 an rtx code for autoincrement addressing modes (e.g. POST_DEC)
77 All of the expressions that appear only in machine descriptions,
78 not in RTL used by the compiler itself, are at the end of the file. */
80 /* Unknown, or no such operation; the enumeration constant should have
82 DEF_RTL_EXPR(UNKNOWN, "UnKnown", "*", RTX_EXTRA)
84 /* Used in the cselib routines to describe a value. Objects of this
85 kind are only allocated in cselib.c, in an alloc pool instead of in
86 GC memory. The only operand of a VALUE is a cselib_val_struct.
87 var-tracking requires this to have a distinct integral value from
88 DECL codes in trees. */
89 DEF_RTL_EXPR(VALUE, "value", "0", RTX_OBJ)
91 /* The RTL generated for a DEBUG_EXPR_DECL. It links back to the
92 DEBUG_EXPR_DECL in the first operand. */
93 DEF_RTL_EXPR(DEBUG_EXPR, "debug_expr", "0", RTX_OBJ)
95 /* ---------------------------------------------------------------------
96 Expressions used in constructing lists.
97 --------------------------------------------------------------------- */
99 /* a linked list of expressions */
100 DEF_RTL_EXPR(EXPR_LIST, "expr_list", "ee", RTX_EXTRA)
102 /* a linked list of instructions.
103 The insns are represented in print by their uids. */
104 DEF_RTL_EXPR(INSN_LIST, "insn_list", "ue", RTX_EXTRA)
106 /* SEQUENCE appears in the result of a `gen_...' function
107 for a DEFINE_EXPAND that wants to make several insns.
108 Its elements are the bodies of the insns that should be made.
109 `emit_insn' takes the SEQUENCE apart and makes separate insns. */
110 DEF_RTL_EXPR(SEQUENCE, "sequence", "E", RTX_EXTRA)
112 /* Refers to the address of its argument. This is only used in alias.c. */
113 DEF_RTL_EXPR(ADDRESS, "address", "e", RTX_MATCH)
115 /* ----------------------------------------------------------------------
116 Expression types used for things in the instruction chain.
118 All formats must start with "iuu" to handle the chain.
119 Each insn expression holds an rtl instruction and its semantics
120 during back-end processing.
121 See macros's in "rtl.h" for the meaning of each rtx->u.fld[].
123 ---------------------------------------------------------------------- */
125 /* An annotation for variable assignment tracking. */
126 DEF_RTL_EXPR(DEBUG_INSN, "debug_insn", "iuuBeiie", RTX_INSN)
128 /* An instruction that cannot jump. */
129 DEF_RTL_EXPR(INSN, "insn", "iuuBeiie", RTX_INSN)
131 /* An instruction that can possibly jump.
132 Fields ( rtx->u.fld[] ) have exact same meaning as INSN's. */
133 DEF_RTL_EXPR(JUMP_INSN, "jump_insn", "iuuBeiie0", RTX_INSN)
135 /* An instruction that can possibly call a subroutine
136 but which will not change which instruction comes next
137 in the current function.
138 Field ( rtx->u.fld[8] ) is CALL_INSN_FUNCTION_USAGE.
139 All other fields ( rtx->u.fld[] ) have exact same meaning as INSN's. */
140 DEF_RTL_EXPR(CALL_INSN, "call_insn", "iuuBeiiee", RTX_INSN)
142 /* A marker that indicates that control will not flow through. */
143 DEF_RTL_EXPR(BARRIER, "barrier", "iuu00000", RTX_EXTRA)
145 /* Holds a label that is followed by instructions.
147 4: is used in jump.c for the use-count of the label.
148 5: is used in the sh backend.
149 6: is a number that is unique in the entire compilation.
150 7: is the user-given name of the label, if any. */
151 DEF_RTL_EXPR(CODE_LABEL, "code_label", "iuuB00is", RTX_EXTRA)
153 /* Say where in the code a source line starts, for symbol table's sake.
155 4: note-specific data
157 6: unique number if insn_note == note_insn_deleted_label. */
158 DEF_RTL_EXPR(NOTE, "note", "iuuB0ni", RTX_EXTRA)
160 /* ----------------------------------------------------------------------
161 Top level constituents of INSN, JUMP_INSN and CALL_INSN.
162 ---------------------------------------------------------------------- */
164 /* Conditionally execute code.
165 Operand 0 is the condition that if true, the code is executed.
166 Operand 1 is the code to be executed (typically a SET).
168 Semantics are that there are no side effects if the condition
169 is false. This pattern is created automatically by the if_convert
170 pass run after reload or by target-specific splitters. */
171 DEF_RTL_EXPR(COND_EXEC, "cond_exec", "ee", RTX_EXTRA)
173 /* Several operations to be done in parallel (perhaps under COND_EXEC). */
174 DEF_RTL_EXPR(PARALLEL, "parallel", "E", RTX_EXTRA)
176 /* A string that is passed through to the assembler as input.
177 One can obviously pass comments through by using the
178 assembler comment syntax.
179 These occur in an insn all by themselves as the PATTERN.
180 They also appear inside an ASM_OPERANDS
181 as a convenient way to hold a string. */
182 DEF_RTL_EXPR(ASM_INPUT, "asm_input", "si", RTX_EXTRA)
184 /* An assembler instruction with operands.
185 1st operand is the instruction template.
186 2nd operand is the constraint for the output.
187 3rd operand is the number of the output this expression refers to.
188 When an insn stores more than one value, a separate ASM_OPERANDS
189 is made for each output; this integer distinguishes them.
190 4th is a vector of values of input operands.
191 5th is a vector of modes and constraints for the input operands.
192 Each element is an ASM_INPUT containing a constraint string
193 and whose mode indicates the mode of the input operand.
194 6th is a vector of labels that may be branched to by the asm.
195 7th is the source line number. */
196 DEF_RTL_EXPR(ASM_OPERANDS, "asm_operands", "ssiEEEi", RTX_EXTRA)
198 /* A machine-specific operation.
199 1st operand is a vector of operands being used by the operation so that
200 any needed reloads can be done.
201 2nd operand is a unique value saying which of a number of machine-specific
202 operations is to be performed.
203 (Note that the vector must be the first operand because of the way that
204 genrecog.c record positions within an insn.)
206 UNSPEC can occur all by itself in a PATTERN, as a component of a PARALLEL,
207 or inside an expression.
208 UNSPEC by itself or as a component of a PARALLEL
209 is currently considered not deletable.
211 FIXME: Replace all uses of UNSPEC that appears by itself or as a component
212 of a PARALLEL with USE.
214 DEF_RTL_EXPR(UNSPEC, "unspec", "Ei", RTX_EXTRA)
216 /* Similar, but a volatile operation and one which may trap. */
217 DEF_RTL_EXPR(UNSPEC_VOLATILE, "unspec_volatile", "Ei", RTX_EXTRA)
219 /* Vector of addresses, stored as full words. */
220 /* Each element is a LABEL_REF to a CODE_LABEL whose address we want. */
221 DEF_RTL_EXPR(ADDR_VEC, "addr_vec", "E", RTX_EXTRA)
223 /* Vector of address differences X0 - BASE, X1 - BASE, ...
224 First operand is BASE; the vector contains the X's.
225 The machine mode of this rtx says how much space to leave
226 for each difference and is adjusted by branch shortening if
227 CASE_VECTOR_SHORTEN_MODE is defined.
228 The third and fourth operands store the target labels with the
229 minimum and maximum addresses respectively.
230 The fifth operand stores flags for use by branch shortening.
231 Set at the start of shorten_branches:
232 min_align: the minimum alignment for any of the target labels.
233 base_after_vec: true iff BASE is after the ADDR_DIFF_VEC.
234 min_after_vec: true iff minimum addr target label is after the ADDR_DIFF_VEC.
235 max_after_vec: true iff maximum addr target label is after the ADDR_DIFF_VEC.
236 min_after_base: true iff minimum address target label is after BASE.
237 max_after_base: true iff maximum address target label is after BASE.
238 Set by the actual branch shortening process:
239 offset_unsigned: true iff offsets have to be treated as unsigned.
240 scale: scaling that is necessary to make offsets fit into the mode.
242 The third, fourth and fifth operands are only valid when
243 CASE_VECTOR_SHORTEN_MODE is defined, and only in an optimizing
246 DEF_RTL_EXPR(ADDR_DIFF_VEC, "addr_diff_vec", "eEee0", RTX_EXTRA)
248 /* Memory prefetch, with attributes supported on some targets.
249 Operand 1 is the address of the memory to fetch.
250 Operand 2 is 1 for a write access, 0 otherwise.
251 Operand 3 is the level of temporal locality; 0 means there is no
252 temporal locality and 1, 2, and 3 are for increasing levels of temporal
255 The attributes specified by operands 2 and 3 are ignored for targets
256 whose prefetch instructions do not support them. */
257 DEF_RTL_EXPR(PREFETCH, "prefetch", "eee", RTX_EXTRA)
259 /* ----------------------------------------------------------------------
260 At the top level of an instruction (perhaps under PARALLEL).
261 ---------------------------------------------------------------------- */
264 Operand 1 is the location (REG, MEM, PC, CC0 or whatever) assigned to.
265 Operand 2 is the value stored there.
266 ALL assignment must use SET.
267 Instructions that do multiple assignments must use multiple SET,
269 DEF_RTL_EXPR(SET, "set", "ee", RTX_EXTRA)
271 /* Indicate something is used in a way that we don't want to explain.
272 For example, subroutine calls will use the register
273 in which the static chain is passed.
275 USE can not appear as an operand of other rtx except for PARALLEL.
276 USE is not deletable, as it indicates that the operand
277 is used in some unknown way. */
278 DEF_RTL_EXPR(USE, "use", "e", RTX_EXTRA)
280 /* Indicate something is clobbered in a way that we don't want to explain.
281 For example, subroutine calls will clobber some physical registers
282 (the ones that are by convention not saved).
284 CLOBBER can not appear as an operand of other rtx except for PARALLEL.
285 CLOBBER of a hard register appearing by itself (not within PARALLEL)
286 is considered undeletable before reload. */
287 DEF_RTL_EXPR(CLOBBER, "clobber", "e", RTX_EXTRA)
289 /* Call a subroutine.
290 Operand 1 is the address to call.
291 Operand 2 is the number of arguments. */
293 DEF_RTL_EXPR(CALL, "call", "ee", RTX_EXTRA)
295 /* Return from a subroutine. */
297 DEF_RTL_EXPR(RETURN, "return", "", RTX_EXTRA)
299 /* Like RETURN, but truly represents only a function return, while
300 RETURN may represent an insn that also performs other functions
301 of the function epilogue. Like RETURN, this may also occur in
302 conditional jumps. */
303 DEF_RTL_EXPR(SIMPLE_RETURN, "simple_return", "", RTX_EXTRA)
305 /* Special for EH return from subroutine. */
307 DEF_RTL_EXPR(EH_RETURN, "eh_return", "", RTX_EXTRA)
310 Operand 1 is the condition.
311 Operand 2 is the trap code.
312 For an unconditional trap, make the condition (const_int 1). */
313 DEF_RTL_EXPR(TRAP_IF, "trap_if", "ee", RTX_EXTRA)
315 /* ----------------------------------------------------------------------
316 Primitive values for use in expressions.
317 ---------------------------------------------------------------------- */
319 /* numeric integer constant */
320 DEF_RTL_EXPR(CONST_INT, "const_int", "w", RTX_CONST_OBJ)
322 /* fixed-point constant */
323 DEF_RTL_EXPR(CONST_FIXED, "const_fixed", "www", RTX_CONST_OBJ)
325 /* numeric floating point constant.
326 Operands hold the value. They are all 'w' and there may be from 2 to 6;
328 DEF_RTL_EXPR(CONST_DOUBLE, "const_double", CONST_DOUBLE_FORMAT, RTX_CONST_OBJ)
330 /* Describes a vector constant. */
331 DEF_RTL_EXPR(CONST_VECTOR, "const_vector", "E", RTX_CONST_OBJ)
333 /* String constant. Used for attributes in machine descriptions and
334 for special cases in DWARF2 debug output. NOT used for source-
335 language string constants. */
336 DEF_RTL_EXPR(CONST_STRING, "const_string", "s", RTX_OBJ)
338 /* This is used to encapsulate an expression whose value is constant
339 (such as the sum of a SYMBOL_REF and a CONST_INT) so that it will be
340 recognized as a constant operand rather than by arithmetic instructions. */
342 DEF_RTL_EXPR(CONST, "const", "e", RTX_CONST_OBJ)
344 /* program counter. Ordinary jumps are represented
345 by a SET whose first operand is (PC). */
346 DEF_RTL_EXPR(PC, "pc", "", RTX_OBJ)
348 /* A register. The "operand" is the register number, accessed with
349 the REGNO macro. If this number is less than FIRST_PSEUDO_REGISTER
350 than a hardware register is being referred to. The second operand
351 holds the original register number - this will be different for a
352 pseudo register that got turned into a hard register. The third
353 operand points to a reg_attrs structure.
354 This rtx needs to have as many (or more) fields as a MEM, since we
355 can change REG rtx's into MEMs during reload. */
356 DEF_RTL_EXPR(REG, "reg", "i00", RTX_OBJ)
358 /* A scratch register. This represents a register used only within a
359 single insn. It will be turned into a REG during register allocation
360 or reload unless the constraint indicates that the register won't be
361 needed, in which case it can remain a SCRATCH. This code is
362 marked as having one operand so it can be turned into a REG. */
363 DEF_RTL_EXPR(SCRATCH, "scratch", "0", RTX_OBJ)
365 /* A reference to a part of another value. The first operand is the
366 complete value and the second is the byte offset of the selected part. */
367 DEF_RTL_EXPR(SUBREG, "subreg", "ei", RTX_EXTRA)
369 /* This one-argument rtx is used for move instructions
370 that are guaranteed to alter only the low part of a destination.
371 Thus, (SET (SUBREG:HI (REG...)) (MEM:HI ...))
372 has an unspecified effect on the high part of REG,
373 but (SET (STRICT_LOW_PART (SUBREG:HI (REG...))) (MEM:HI ...))
374 is guaranteed to alter only the bits of REG that are in HImode.
376 The actual instruction used is probably the same in both cases,
377 but the register constraints may be tighter when STRICT_LOW_PART
380 DEF_RTL_EXPR(STRICT_LOW_PART, "strict_low_part", "e", RTX_EXTRA)
382 /* (CONCAT a b) represents the virtual concatenation of a and b
383 to make a value that has as many bits as a and b put together.
384 This is used for complex values. Normally it appears only
385 in DECL_RTLs and during RTL generation, but not in the insn chain. */
386 DEF_RTL_EXPR(CONCAT, "concat", "ee", RTX_OBJ)
388 /* (CONCATN [a1 a2 ... an]) represents the virtual concatenation of
389 all An to make a value. This is an extension of CONCAT to larger
390 number of components. Like CONCAT, it should not appear in the
391 insn chain. Every element of the CONCATN is the same size. */
392 DEF_RTL_EXPR(CONCATN, "concatn", "E", RTX_OBJ)
394 /* A memory location; operand is the address. The second operand is the
395 alias set to which this MEM belongs. We use `0' instead of `w' for this
396 field so that the field need not be specified in machine descriptions. */
397 DEF_RTL_EXPR(MEM, "mem", "e0", RTX_OBJ)
399 /* Reference to an assembler label in the code for this function.
400 The operand is a CODE_LABEL found in the insn chain. */
401 DEF_RTL_EXPR(LABEL_REF, "label_ref", "u", RTX_CONST_OBJ)
403 /* Reference to a named label:
404 Operand 0: label name
405 Operand 1: flags (see SYMBOL_FLAG_* in rtl.h)
406 Operand 2: tree from which this symbol is derived, or null.
407 This is either a DECL node, or some kind of constant. */
408 DEF_RTL_EXPR(SYMBOL_REF, "symbol_ref", "s00", RTX_CONST_OBJ)
410 /* The condition code register is represented, in our imagination,
411 as a register holding a value that can be compared to zero.
412 In fact, the machine has already compared them and recorded the
413 results; but instructions that look at the condition code
414 pretend to be looking at the entire value and comparing it. */
415 DEF_RTL_EXPR(CC0, "cc0", "", RTX_OBJ)
417 /* ----------------------------------------------------------------------
418 Expressions for operators in an rtl pattern
419 ---------------------------------------------------------------------- */
421 /* if_then_else. This is used in representing ordinary
422 conditional jump instructions.
427 DEF_RTL_EXPR(IF_THEN_ELSE, "if_then_else", "eee", RTX_TERNARY)
429 /* Comparison, produces a condition code result. */
430 DEF_RTL_EXPR(COMPARE, "compare", "ee", RTX_BIN_ARITH)
433 DEF_RTL_EXPR(PLUS, "plus", "ee", RTX_COMM_ARITH)
435 /* Operand 0 minus operand 1. */
436 DEF_RTL_EXPR(MINUS, "minus", "ee", RTX_BIN_ARITH)
438 /* Minus operand 0. */
439 DEF_RTL_EXPR(NEG, "neg", "e", RTX_UNARY)
441 DEF_RTL_EXPR(MULT, "mult", "ee", RTX_COMM_ARITH)
443 /* Multiplication with signed saturation */
444 DEF_RTL_EXPR(SS_MULT, "ss_mult", "ee", RTX_COMM_ARITH)
445 /* Multiplication with unsigned saturation */
446 DEF_RTL_EXPR(US_MULT, "us_mult", "ee", RTX_COMM_ARITH)
448 /* Operand 0 divided by operand 1. */
449 DEF_RTL_EXPR(DIV, "div", "ee", RTX_BIN_ARITH)
450 /* Division with signed saturation */
451 DEF_RTL_EXPR(SS_DIV, "ss_div", "ee", RTX_BIN_ARITH)
452 /* Division with unsigned saturation */
453 DEF_RTL_EXPR(US_DIV, "us_div", "ee", RTX_BIN_ARITH)
455 /* Remainder of operand 0 divided by operand 1. */
456 DEF_RTL_EXPR(MOD, "mod", "ee", RTX_BIN_ARITH)
458 /* Unsigned divide and remainder. */
459 DEF_RTL_EXPR(UDIV, "udiv", "ee", RTX_BIN_ARITH)
460 DEF_RTL_EXPR(UMOD, "umod", "ee", RTX_BIN_ARITH)
462 /* Bitwise operations. */
463 DEF_RTL_EXPR(AND, "and", "ee", RTX_COMM_ARITH)
464 DEF_RTL_EXPR(IOR, "ior", "ee", RTX_COMM_ARITH)
465 DEF_RTL_EXPR(XOR, "xor", "ee", RTX_COMM_ARITH)
466 DEF_RTL_EXPR(NOT, "not", "e", RTX_UNARY)
469 0: value to be shifted.
470 1: number of bits. */
471 DEF_RTL_EXPR(ASHIFT, "ashift", "ee", RTX_BIN_ARITH) /* shift left */
472 DEF_RTL_EXPR(ROTATE, "rotate", "ee", RTX_BIN_ARITH) /* rotate left */
473 DEF_RTL_EXPR(ASHIFTRT, "ashiftrt", "ee", RTX_BIN_ARITH) /* arithmetic shift right */
474 DEF_RTL_EXPR(LSHIFTRT, "lshiftrt", "ee", RTX_BIN_ARITH) /* logical shift right */
475 DEF_RTL_EXPR(ROTATERT, "rotatert", "ee", RTX_BIN_ARITH) /* rotate right */
477 /* Minimum and maximum values of two operands. We need both signed and
478 unsigned forms. (We cannot use MIN for SMIN because it conflicts
479 with a macro of the same name.) The signed variants should be used
480 with floating point. Further, if both operands are zeros, or if either
481 operand is NaN, then it is unspecified which of the two operands is
482 returned as the result. */
484 DEF_RTL_EXPR(SMIN, "smin", "ee", RTX_COMM_ARITH)
485 DEF_RTL_EXPR(SMAX, "smax", "ee", RTX_COMM_ARITH)
486 DEF_RTL_EXPR(UMIN, "umin", "ee", RTX_COMM_ARITH)
487 DEF_RTL_EXPR(UMAX, "umax", "ee", RTX_COMM_ARITH)
489 /* These unary operations are used to represent incrementation
490 and decrementation as they occur in memory addresses.
491 The amount of increment or decrement are not represented
492 because they can be understood from the machine-mode of the
493 containing MEM. These operations exist in only two cases:
494 1. pushes onto the stack.
495 2. created automatically by the auto-inc-dec pass. */
496 DEF_RTL_EXPR(PRE_DEC, "pre_dec", "e", RTX_AUTOINC)
497 DEF_RTL_EXPR(PRE_INC, "pre_inc", "e", RTX_AUTOINC)
498 DEF_RTL_EXPR(POST_DEC, "post_dec", "e", RTX_AUTOINC)
499 DEF_RTL_EXPR(POST_INC, "post_inc", "e", RTX_AUTOINC)
501 /* These binary operations are used to represent generic address
502 side-effects in memory addresses, except for simple incrementation
503 or decrementation which use the above operations. They are
504 created automatically by the life_analysis pass in flow.c.
505 The first operand is a REG which is used as the address.
506 The second operand is an expression that is assigned to the
507 register, either before (PRE_MODIFY) or after (POST_MODIFY)
508 evaluating the address.
509 Currently, the compiler can only handle second operands of the
510 form (plus (reg) (reg)) and (plus (reg) (const_int)), where
511 the first operand of the PLUS has to be the same register as
512 the first operand of the *_MODIFY. */
513 DEF_RTL_EXPR(PRE_MODIFY, "pre_modify", "ee", RTX_AUTOINC)
514 DEF_RTL_EXPR(POST_MODIFY, "post_modify", "ee", RTX_AUTOINC)
516 /* Comparison operations. The ordered comparisons exist in two
517 flavors, signed and unsigned. */
518 DEF_RTL_EXPR(NE, "ne", "ee", RTX_COMM_COMPARE)
519 DEF_RTL_EXPR(EQ, "eq", "ee", RTX_COMM_COMPARE)
520 DEF_RTL_EXPR(GE, "ge", "ee", RTX_COMPARE)
521 DEF_RTL_EXPR(GT, "gt", "ee", RTX_COMPARE)
522 DEF_RTL_EXPR(LE, "le", "ee", RTX_COMPARE)
523 DEF_RTL_EXPR(LT, "lt", "ee", RTX_COMPARE)
524 DEF_RTL_EXPR(GEU, "geu", "ee", RTX_COMPARE)
525 DEF_RTL_EXPR(GTU, "gtu", "ee", RTX_COMPARE)
526 DEF_RTL_EXPR(LEU, "leu", "ee", RTX_COMPARE)
527 DEF_RTL_EXPR(LTU, "ltu", "ee", RTX_COMPARE)
529 /* Additional floating point unordered comparison flavors. */
530 DEF_RTL_EXPR(UNORDERED, "unordered", "ee", RTX_COMM_COMPARE)
531 DEF_RTL_EXPR(ORDERED, "ordered", "ee", RTX_COMM_COMPARE)
533 /* These are equivalent to unordered or ... */
534 DEF_RTL_EXPR(UNEQ, "uneq", "ee", RTX_COMM_COMPARE)
535 DEF_RTL_EXPR(UNGE, "unge", "ee", RTX_COMPARE)
536 DEF_RTL_EXPR(UNGT, "ungt", "ee", RTX_COMPARE)
537 DEF_RTL_EXPR(UNLE, "unle", "ee", RTX_COMPARE)
538 DEF_RTL_EXPR(UNLT, "unlt", "ee", RTX_COMPARE)
540 /* This is an ordered NE, ie !UNEQ, ie false for NaN. */
541 DEF_RTL_EXPR(LTGT, "ltgt", "ee", RTX_COMM_COMPARE)
543 /* Represents the result of sign-extending the sole operand.
544 The machine modes of the operand and of the SIGN_EXTEND expression
545 determine how much sign-extension is going on. */
546 DEF_RTL_EXPR(SIGN_EXTEND, "sign_extend", "e", RTX_UNARY)
548 /* Similar for zero-extension (such as unsigned short to int). */
549 DEF_RTL_EXPR(ZERO_EXTEND, "zero_extend", "e", RTX_UNARY)
551 /* Similar but here the operand has a wider mode. */
552 DEF_RTL_EXPR(TRUNCATE, "truncate", "e", RTX_UNARY)
554 /* Similar for extending floating-point values (such as SFmode to DFmode). */
555 DEF_RTL_EXPR(FLOAT_EXTEND, "float_extend", "e", RTX_UNARY)
556 DEF_RTL_EXPR(FLOAT_TRUNCATE, "float_truncate", "e", RTX_UNARY)
558 /* Conversion of fixed point operand to floating point value. */
559 DEF_RTL_EXPR(FLOAT, "float", "e", RTX_UNARY)
561 /* With fixed-point machine mode:
562 Conversion of floating point operand to fixed point value.
563 Value is defined only when the operand's value is an integer.
564 With floating-point machine mode (and operand with same mode):
565 Operand is rounded toward zero to produce an integer value
566 represented in floating point. */
567 DEF_RTL_EXPR(FIX, "fix", "e", RTX_UNARY)
569 /* Conversion of unsigned fixed point operand to floating point value. */
570 DEF_RTL_EXPR(UNSIGNED_FLOAT, "unsigned_float", "e", RTX_UNARY)
572 /* With fixed-point machine mode:
573 Conversion of floating point operand to *unsigned* fixed point value.
574 Value is defined only when the operand's value is an integer. */
575 DEF_RTL_EXPR(UNSIGNED_FIX, "unsigned_fix", "e", RTX_UNARY)
577 /* Conversions involving fractional fixed-point types without saturation,
579 fractional to fractional (of different precision),
580 signed integer to fractional,
581 fractional to signed integer,
582 floating point to fractional,
583 fractional to floating point.
584 NOTE: fractional can be either signed or unsigned for conversions. */
585 DEF_RTL_EXPR(FRACT_CONVERT, "fract_convert", "e", RTX_UNARY)
587 /* Conversions involving fractional fixed-point types and unsigned integer
588 without saturation, including:
589 unsigned integer to fractional,
590 fractional to unsigned integer.
591 NOTE: fractional can be either signed or unsigned for conversions. */
592 DEF_RTL_EXPR(UNSIGNED_FRACT_CONVERT, "unsigned_fract_convert", "e", RTX_UNARY)
594 /* Conversions involving fractional fixed-point types with saturation,
596 fractional to fractional (of different precision),
597 signed integer to fractional,
598 floating point to fractional.
599 NOTE: fractional can be either signed or unsigned for conversions. */
600 DEF_RTL_EXPR(SAT_FRACT, "sat_fract", "e", RTX_UNARY)
602 /* Conversions involving fractional fixed-point types and unsigned integer
603 with saturation, including:
604 unsigned integer to fractional.
605 NOTE: fractional can be either signed or unsigned for conversions. */
606 DEF_RTL_EXPR(UNSIGNED_SAT_FRACT, "unsigned_sat_fract", "e", RTX_UNARY)
609 DEF_RTL_EXPR(ABS, "abs", "e", RTX_UNARY)
612 DEF_RTL_EXPR(SQRT, "sqrt", "e", RTX_UNARY)
615 DEF_RTL_EXPR(BSWAP, "bswap", "e", RTX_UNARY)
617 /* Find first bit that is set.
618 Value is 1 + number of trailing zeros in the arg.,
620 DEF_RTL_EXPR(FFS, "ffs", "e", RTX_UNARY)
622 /* Count number of leading redundant sign bits (number of leading
623 sign bits minus one). */
624 DEF_RTL_EXPR(CLRSB, "clrsb", "e", RTX_UNARY)
626 /* Count leading zeros. */
627 DEF_RTL_EXPR(CLZ, "clz", "e", RTX_UNARY)
629 /* Count trailing zeros. */
630 DEF_RTL_EXPR(CTZ, "ctz", "e", RTX_UNARY)
632 /* Population count (number of 1 bits). */
633 DEF_RTL_EXPR(POPCOUNT, "popcount", "e", RTX_UNARY)
635 /* Population parity (number of 1 bits modulo 2). */
636 DEF_RTL_EXPR(PARITY, "parity", "e", RTX_UNARY)
638 /* Reference to a signed bit-field of specified size and position.
639 Operand 0 is the memory unit (usually SImode or QImode) which
640 contains the field's first bit. Operand 1 is the width, in bits.
641 Operand 2 is the number of bits in the memory unit before the
642 first bit of this field.
643 If BITS_BIG_ENDIAN is defined, the first bit is the msb and
644 operand 2 counts from the msb of the memory unit.
645 Otherwise, the first bit is the lsb and operand 2 counts from
646 the lsb of the memory unit.
647 This kind of expression can not appear as an lvalue in RTL. */
648 DEF_RTL_EXPR(SIGN_EXTRACT, "sign_extract", "eee", RTX_BITFIELD_OPS)
650 /* Similar for unsigned bit-field.
651 But note! This kind of expression _can_ appear as an lvalue. */
652 DEF_RTL_EXPR(ZERO_EXTRACT, "zero_extract", "eee", RTX_BITFIELD_OPS)
654 /* For RISC machines. These save memory when splitting insns. */
656 /* HIGH are the high-order bits of a constant expression. */
657 DEF_RTL_EXPR(HIGH, "high", "e", RTX_CONST_OBJ)
659 /* LO_SUM is the sum of a register and the low-order bits
660 of a constant expression. */
661 DEF_RTL_EXPR(LO_SUM, "lo_sum", "ee", RTX_OBJ)
663 /* Describes a merge operation between two vector values.
664 Operands 0 and 1 are the vectors to be merged, operand 2 is a bitmask
665 that specifies where the parts of the result are taken from. Set bits
666 indicate operand 0, clear bits indicate operand 1. The parts are defined
667 by the mode of the vectors. */
668 DEF_RTL_EXPR(VEC_MERGE, "vec_merge", "eee", RTX_TERNARY)
670 /* Describes an operation that selects parts of a vector.
671 Operands 0 is the source vector, operand 1 is a PARALLEL that contains
672 a CONST_INT for each of the subparts of the result vector, giving the
673 number of the source subpart that should be stored into it. */
674 DEF_RTL_EXPR(VEC_SELECT, "vec_select", "ee", RTX_BIN_ARITH)
676 /* Describes a vector concat operation. Operands 0 and 1 are the source
677 vectors, the result is a vector that is as long as operands 0 and 1
678 combined and is the concatenation of the two source vectors. */
679 DEF_RTL_EXPR(VEC_CONCAT, "vec_concat", "ee", RTX_BIN_ARITH)
681 /* Describes an operation that converts a small vector into a larger one by
682 duplicating the input values. The output vector mode must have the same
683 submodes as the input vector mode, and the number of output parts must be
684 an integer multiple of the number of input parts. */
685 DEF_RTL_EXPR(VEC_DUPLICATE, "vec_duplicate", "e", RTX_UNARY)
687 /* Addition with signed saturation */
688 DEF_RTL_EXPR(SS_PLUS, "ss_plus", "ee", RTX_COMM_ARITH)
690 /* Addition with unsigned saturation */
691 DEF_RTL_EXPR(US_PLUS, "us_plus", "ee", RTX_COMM_ARITH)
693 /* Operand 0 minus operand 1, with signed saturation. */
694 DEF_RTL_EXPR(SS_MINUS, "ss_minus", "ee", RTX_BIN_ARITH)
696 /* Negation with signed saturation. */
697 DEF_RTL_EXPR(SS_NEG, "ss_neg", "e", RTX_UNARY)
698 /* Negation with unsigned saturation. */
699 DEF_RTL_EXPR(US_NEG, "us_neg", "e", RTX_UNARY)
701 /* Absolute value with signed saturation. */
702 DEF_RTL_EXPR(SS_ABS, "ss_abs", "e", RTX_UNARY)
704 /* Shift left with signed saturation. */
705 DEF_RTL_EXPR(SS_ASHIFT, "ss_ashift", "ee", RTX_BIN_ARITH)
707 /* Shift left with unsigned saturation. */
708 DEF_RTL_EXPR(US_ASHIFT, "us_ashift", "ee", RTX_BIN_ARITH)
710 /* Operand 0 minus operand 1, with unsigned saturation. */
711 DEF_RTL_EXPR(US_MINUS, "us_minus", "ee", RTX_BIN_ARITH)
713 /* Signed saturating truncate. */
714 DEF_RTL_EXPR(SS_TRUNCATE, "ss_truncate", "e", RTX_UNARY)
716 /* Unsigned saturating truncate. */
717 DEF_RTL_EXPR(US_TRUNCATE, "us_truncate", "e", RTX_UNARY)
719 /* Floating point multiply/add combined instruction. */
720 DEF_RTL_EXPR(FMA, "fma", "eee", RTX_TERNARY)
722 /* Information about the variable and its location. */
723 /* Changed 'te' to 'tei'; the 'i' field is for recording
724 initialization status of variables. */
725 DEF_RTL_EXPR(VAR_LOCATION, "var_location", "tei", RTX_EXTRA)
727 /* Used in VAR_LOCATION for a pointer to a decl that is no longer
729 DEF_RTL_EXPR(DEBUG_IMPLICIT_PTR, "debug_implicit_ptr", "t", RTX_OBJ)
731 /* Represents value that argument had on function entry. The
732 single argument is the DECL_INCOMING_RTL of the corresponding
734 DEF_RTL_EXPR(ENTRY_VALUE, "entry_value", "0", RTX_OBJ)
736 /* Used in VAR_LOCATION for a reference to a parameter that has
737 been optimized away completely. */
738 DEF_RTL_EXPR(DEBUG_PARAMETER_REF, "debug_parameter_ref", "t", RTX_OBJ)
740 /* All expressions from this point forward appear only in machine
742 #ifdef GENERATOR_FILE
744 /* Pattern-matching operators: */
746 /* Use the function named by the second arg (the string)
747 as a predicate; if matched, store the structure that was matched
748 in the operand table at index specified by the first arg (the integer).
749 If the second arg is the null string, the structure is just stored.
751 A third string argument indicates to the register allocator restrictions
752 on where the operand can be allocated.
754 If the target needs no restriction on any instruction this field should
757 The string is prepended by:
758 '=' to indicate the operand is only written to.
759 '+' to indicate the operand is both read and written to.
761 Each character in the string represents an allocable class for an operand.
762 'g' indicates the operand can be any valid class.
763 'i' indicates the operand can be immediate (in the instruction) data.
764 'r' indicates the operand can be in a register.
765 'm' indicates the operand can be in memory.
766 'o' a subset of the 'm' class. Those memory addressing modes that
767 can be offset at compile time (have a constant added to them).
769 Other characters indicate target dependent operand classes and
770 are described in each target's machine description.
772 For instructions with more than one operand, sets of classes can be
773 separated by a comma to indicate the appropriate multi-operand constraints.
774 There must be a 1 to 1 correspondence between these sets of classes in
775 all operands for an instruction.
777 DEF_RTL_EXPR(MATCH_OPERAND, "match_operand", "iss", RTX_MATCH)
779 /* Match a SCRATCH or a register. When used to generate rtl, a
780 SCRATCH is generated. As for MATCH_OPERAND, the mode specifies
781 the desired mode and the first argument is the operand number.
782 The second argument is the constraint. */
783 DEF_RTL_EXPR(MATCH_SCRATCH, "match_scratch", "is", RTX_MATCH)
785 /* Apply a predicate, AND match recursively the operands of the rtx.
786 Operand 0 is the operand-number, as in match_operand.
787 Operand 1 is a predicate to apply (as a string, a function name).
788 Operand 2 is a vector of expressions, each of which must match
789 one subexpression of the rtx this construct is matching. */
790 DEF_RTL_EXPR(MATCH_OPERATOR, "match_operator", "isE", RTX_MATCH)
792 /* Match a PARALLEL of arbitrary length. The predicate is applied
793 to the PARALLEL and the initial expressions in the PARALLEL are matched.
794 Operand 0 is the operand-number, as in match_operand.
795 Operand 1 is a predicate to apply to the PARALLEL.
796 Operand 2 is a vector of expressions, each of which must match the
797 corresponding element in the PARALLEL. */
798 DEF_RTL_EXPR(MATCH_PARALLEL, "match_parallel", "isE", RTX_MATCH)
800 /* Match only something equal to what is stored in the operand table
801 at the index specified by the argument. Use with MATCH_OPERAND. */
802 DEF_RTL_EXPR(MATCH_DUP, "match_dup", "i", RTX_MATCH)
804 /* Match only something equal to what is stored in the operand table
805 at the index specified by the argument. Use with MATCH_OPERATOR. */
806 DEF_RTL_EXPR(MATCH_OP_DUP, "match_op_dup", "iE", RTX_MATCH)
808 /* Match only something equal to what is stored in the operand table
809 at the index specified by the argument. Use with MATCH_PARALLEL. */
810 DEF_RTL_EXPR(MATCH_PAR_DUP, "match_par_dup", "iE", RTX_MATCH)
812 /* Appears only in define_predicate/define_special_predicate
813 expressions. Evaluates true only if the operand has an RTX code
814 from the set given by the argument (a comma-separated list). If the
815 second argument is present and nonempty, it is a sequence of digits
816 and/or letters which indicates the subexpression to test, using the
817 same syntax as genextract/genrecog's location strings: 0-9 for
818 XEXP (op, n), a-z for XVECEXP (op, 0, n); each character applies to
819 the result of the one before it. */
820 DEF_RTL_EXPR(MATCH_CODE, "match_code", "ss", RTX_MATCH)
822 /* Used to inject a C conditional expression into an .md file. It can
823 appear in a predicate definition or an attribute expression. */
824 DEF_RTL_EXPR(MATCH_TEST, "match_test", "s", RTX_MATCH)
826 /* Insn (and related) definitions. */
828 /* Definition of the pattern for one kind of instruction.
830 0: names this instruction.
831 If the name is the null string, the instruction is in the
832 machine description just to be recognized, and will never be emitted by
833 the tree to rtl expander.
835 2: is a string which is a C expression
836 giving an additional condition for recognizing this pattern.
837 A null string means no extra condition.
838 3: is the action to execute if this pattern is matched.
839 If this assembler code template starts with a * then it is a fragment of
840 C code to run to decide on a template to use. Otherwise, it is the
842 4: optionally, a vector of attributes for this insn.
844 DEF_RTL_EXPR(DEFINE_INSN, "define_insn", "sEsTV", RTX_EXTRA)
846 /* Definition of a peephole optimization.
847 1st operand: vector of insn patterns to match
848 2nd operand: C expression that must be true
849 3rd operand: template or C code to produce assembler output.
850 4: optionally, a vector of attributes for this insn.
852 This form is deprecated; use define_peephole2 instead. */
853 DEF_RTL_EXPR(DEFINE_PEEPHOLE, "define_peephole", "EsTV", RTX_EXTRA)
855 /* Definition of a split operation.
856 1st operand: insn pattern to match
857 2nd operand: C expression that must be true
858 3rd operand: vector of insn patterns to place into a SEQUENCE
859 4th operand: optionally, some C code to execute before generating the
860 insns. This might, for example, create some RTX's and store them in
861 elements of `recog_data.operand' for use by the vector of
863 (`operands' is an alias here for `recog_data.operand'). */
864 DEF_RTL_EXPR(DEFINE_SPLIT, "define_split", "EsES", RTX_EXTRA)
866 /* Definition of an insn and associated split.
867 This is the concatenation, with a few modifications, of a define_insn
868 and a define_split which share the same pattern.
870 0: names this instruction.
871 If the name is the null string, the instruction is in the
872 machine description just to be recognized, and will never be emitted by
873 the tree to rtl expander.
875 2: is a string which is a C expression
876 giving an additional condition for recognizing this pattern.
877 A null string means no extra condition.
878 3: is the action to execute if this pattern is matched.
879 If this assembler code template starts with a * then it is a fragment of
880 C code to run to decide on a template to use. Otherwise, it is the
882 4: C expression that must be true for split. This may start with "&&"
883 in which case the split condition is the logical and of the insn
884 condition and what follows the "&&" of this operand.
885 5: vector of insn patterns to place into a SEQUENCE
886 6: optionally, some C code to execute before generating the
887 insns. This might, for example, create some RTX's and store them in
888 elements of `recog_data.operand' for use by the vector of
890 (`operands' is an alias here for `recog_data.operand').
891 7: optionally, a vector of attributes for this insn. */
892 DEF_RTL_EXPR(DEFINE_INSN_AND_SPLIT, "define_insn_and_split", "sEsTsESV", RTX_EXTRA)
894 /* Definition of an RTL peephole operation.
895 Follows the same arguments as define_split. */
896 DEF_RTL_EXPR(DEFINE_PEEPHOLE2, "define_peephole2", "EsES", RTX_EXTRA)
898 /* Define how to generate multiple insns for a standard insn name.
899 1st operand: the insn name.
900 2nd operand: vector of insn-patterns.
901 Use match_operand to substitute an element of `recog_data.operand'.
902 3rd operand: C expression that must be true for this to be available.
903 This may not test any operands.
904 4th operand: Extra C code to execute before generating the insns.
905 This might, for example, create some RTX's and store them in
906 elements of `recog_data.operand' for use by the vector of
908 (`operands' is an alias here for `recog_data.operand'). */
909 DEF_RTL_EXPR(DEFINE_EXPAND, "define_expand", "sEss", RTX_EXTRA)
911 /* Define a requirement for delay slots.
912 1st operand: Condition involving insn attributes that, if true,
913 indicates that the insn requires the number of delay slots
915 2nd operand: Vector whose length is the three times the number of delay
917 Each entry gives three conditions, each involving attributes.
918 The first must be true for an insn to occupy that delay slot
919 location. The second is true for all insns that can be
920 annulled if the branch is true and the third is true for all
921 insns that can be annulled if the branch is false.
923 Multiple DEFINE_DELAYs may be present. They indicate differing
924 requirements for delay slots. */
925 DEF_RTL_EXPR(DEFINE_DELAY, "define_delay", "eE", RTX_EXTRA)
927 /* Define attribute computation for `asm' instructions. */
928 DEF_RTL_EXPR(DEFINE_ASM_ATTRIBUTES, "define_asm_attributes", "V", RTX_EXTRA)
930 /* Definition of a conditional execution meta operation. Automatically
931 generates new instances of DEFINE_INSN, selected by having attribute
932 "predicable" true. The new pattern will contain a COND_EXEC and the
933 predicate at top-level.
936 0: The predicate pattern. The top-level form should match a
937 relational operator. Operands should have only one alternative.
938 1: A C expression giving an additional condition for recognizing
939 the generated pattern.
940 2: A template or C code to produce assembler output. */
941 DEF_RTL_EXPR(DEFINE_COND_EXEC, "define_cond_exec", "Ess", RTX_EXTRA)
943 /* Definition of an operand predicate. The difference between
944 DEFINE_PREDICATE and DEFINE_SPECIAL_PREDICATE is that genrecog will
945 not warn about a match_operand with no mode if it has a predicate
946 defined with DEFINE_SPECIAL_PREDICATE.
949 0: The name of the predicate.
950 1: A boolean expression which computes whether or not the predicate
951 matches. This expression can use IOR, AND, NOT, MATCH_OPERAND,
952 MATCH_CODE, and MATCH_TEST. It must be specific enough that genrecog
953 can calculate the set of RTX codes that can possibly match.
954 2: A C function body which must return true for the predicate to match.
955 Optional. Use this when the test is too complicated to fit into a
956 match_test expression. */
957 DEF_RTL_EXPR(DEFINE_PREDICATE, "define_predicate", "ses", RTX_EXTRA)
958 DEF_RTL_EXPR(DEFINE_SPECIAL_PREDICATE, "define_special_predicate", "ses", RTX_EXTRA)
960 /* Definition of a register operand constraint. This simply maps the
961 constraint string to a register class.
964 0: The name of the constraint (often, but not always, a single letter).
965 1: A C expression which evaluates to the appropriate register class for
966 this constraint. If this is not just a constant, it should look only
967 at -m switches and the like.
968 2: A docstring for this constraint, in Texinfo syntax; not currently
969 used, in future will be incorporated into the manual's list of
970 machine-specific operand constraints. */
971 DEF_RTL_EXPR(DEFINE_REGISTER_CONSTRAINT, "define_register_constraint", "sss", RTX_EXTRA)
973 /* Definition of a non-register operand constraint. These look at the
974 operand and decide whether it fits the constraint.
976 DEFINE_CONSTRAINT gets no special treatment if it fails to match.
977 It is appropriate for constant-only constraints, and most others.
979 DEFINE_MEMORY_CONSTRAINT tells reload that this constraint can be made
980 to match, if it doesn't already, by converting the operand to the form
981 (mem (reg X)) where X is a base register. It is suitable for constraints
982 that describe a subset of all memory references.
984 DEFINE_ADDRESS_CONSTRAINT tells reload that this constraint can be made
985 to match, if it doesn't already, by converting the operand to the form
986 (reg X) where X is a base register. It is suitable for constraints that
987 describe a subset of all address references.
989 When in doubt, use plain DEFINE_CONSTRAINT.
992 0: The name of the constraint (often, but not always, a single letter).
993 1: A docstring for this constraint, in Texinfo syntax; not currently
994 used, in future will be incorporated into the manual's list of
995 machine-specific operand constraints.
996 2: A boolean expression which computes whether or not the constraint
997 matches. It should follow the same rules as a define_predicate
998 expression, including the bit about specifying the set of RTX codes
999 that could possibly match. MATCH_TEST subexpressions may make use of
1001 `op' - the RTL object defining the operand.
1002 `mode' - the mode of `op'.
1003 `ival' - INTVAL(op), if op is a CONST_INT.
1004 `hval' - CONST_DOUBLE_HIGH(op), if op is an integer CONST_DOUBLE.
1005 `lval' - CONST_DOUBLE_LOW(op), if op is an integer CONST_DOUBLE.
1006 `rval' - CONST_DOUBLE_REAL_VALUE(op), if op is a floating-point
1008 Do not use ival/hval/lval/rval if op is not the appropriate kind of
1010 DEF_RTL_EXPR(DEFINE_CONSTRAINT, "define_constraint", "sse", RTX_EXTRA)
1011 DEF_RTL_EXPR(DEFINE_MEMORY_CONSTRAINT, "define_memory_constraint", "sse", RTX_EXTRA)
1012 DEF_RTL_EXPR(DEFINE_ADDRESS_CONSTRAINT, "define_address_constraint", "sse", RTX_EXTRA)
1015 /* Constructions for CPU pipeline description described by NDFAs. */
1017 /* (define_cpu_unit string [string]) describes cpu functional
1018 units (separated by comma).
1020 1st operand: Names of cpu functional units.
1021 2nd operand: Name of automaton (see comments for DEFINE_AUTOMATON).
1023 All define_reservations, define_cpu_units, and
1024 define_query_cpu_units should have unique names which may not be
1026 DEF_RTL_EXPR(DEFINE_CPU_UNIT, "define_cpu_unit", "sS", RTX_EXTRA)
1028 /* (define_query_cpu_unit string [string]) describes cpu functional
1029 units analogously to define_cpu_unit. The reservation of such
1030 units can be queried for automaton state. */
1031 DEF_RTL_EXPR(DEFINE_QUERY_CPU_UNIT, "define_query_cpu_unit", "sS", RTX_EXTRA)
1033 /* (exclusion_set string string) means that each CPU functional unit
1034 in the first string can not be reserved simultaneously with any
1035 unit whose name is in the second string and vise versa. CPU units
1036 in the string are separated by commas. For example, it is useful
1037 for description CPU with fully pipelined floating point functional
1038 unit which can execute simultaneously only single floating point
1039 insns or only double floating point insns. All CPU functional
1040 units in a set should belong to the same automaton. */
1041 DEF_RTL_EXPR(EXCLUSION_SET, "exclusion_set", "ss", RTX_EXTRA)
1043 /* (presence_set string string) means that each CPU functional unit in
1044 the first string can not be reserved unless at least one of pattern
1045 of units whose names are in the second string is reserved. This is
1046 an asymmetric relation. CPU units or unit patterns in the strings
1047 are separated by commas. Pattern is one unit name or unit names
1048 separated by white-spaces.
1050 For example, it is useful for description that slot1 is reserved
1051 after slot0 reservation for a VLIW processor. We could describe it
1052 by the following construction
1054 (presence_set "slot1" "slot0")
1056 Or slot1 is reserved only after slot0 and unit b0 reservation. In
1057 this case we could write
1059 (presence_set "slot1" "slot0 b0")
1061 All CPU functional units in a set should belong to the same
1063 DEF_RTL_EXPR(PRESENCE_SET, "presence_set", "ss", RTX_EXTRA)
1065 /* (final_presence_set string string) is analogous to `presence_set'.
1066 The difference between them is when checking is done. When an
1067 instruction is issued in given automaton state reflecting all
1068 current and planned unit reservations, the automaton state is
1069 changed. The first state is a source state, the second one is a
1070 result state. Checking for `presence_set' is done on the source
1071 state reservation, checking for `final_presence_set' is done on the
1072 result reservation. This construction is useful to describe a
1073 reservation which is actually two subsequent reservations. For
1076 (presence_set "slot1" "slot0")
1078 the following insn will be never issued (because slot1 requires
1079 slot0 which is absent in the source state).
1081 (define_reservation "insn_and_nop" "slot0 + slot1")
1083 but it can be issued if we use analogous `final_presence_set'. */
1084 DEF_RTL_EXPR(FINAL_PRESENCE_SET, "final_presence_set", "ss", RTX_EXTRA)
1086 /* (absence_set string string) means that each CPU functional unit in
1087 the first string can be reserved only if each pattern of units
1088 whose names are in the second string is not reserved. This is an
1089 asymmetric relation (actually exclusion set is analogous to this
1090 one but it is symmetric). CPU units or unit patterns in the string
1091 are separated by commas. Pattern is one unit name or unit names
1092 separated by white-spaces.
1094 For example, it is useful for description that slot0 can not be
1095 reserved after slot1 or slot2 reservation for a VLIW processor. We
1096 could describe it by the following construction
1098 (absence_set "slot2" "slot0, slot1")
1100 Or slot2 can not be reserved if slot0 and unit b0 are reserved or
1101 slot1 and unit b1 are reserved . In this case we could write
1103 (absence_set "slot2" "slot0 b0, slot1 b1")
1105 All CPU functional units in a set should to belong the same
1107 DEF_RTL_EXPR(ABSENCE_SET, "absence_set", "ss", RTX_EXTRA)
1109 /* (final_absence_set string string) is analogous to `absence_set' but
1110 checking is done on the result (state) reservation. See comments
1111 for `final_presence_set'. */
1112 DEF_RTL_EXPR(FINAL_ABSENCE_SET, "final_absence_set", "ss", RTX_EXTRA)
1114 /* (define_bypass number out_insn_names in_insn_names) names bypass
1115 with given latency (the first number) from insns given by the first
1116 string (see define_insn_reservation) into insns given by the second
1117 string. Insn names in the strings are separated by commas. The
1118 third operand is optional name of function which is additional
1119 guard for the bypass. The function will get the two insns as
1120 parameters. If the function returns zero the bypass will be
1121 ignored for this case. Additional guard is necessary to recognize
1122 complicated bypasses, e.g. when consumer is load address. If there
1123 are more one bypass with the same output and input insns, the
1124 chosen bypass is the first bypass with a guard in description whose
1125 guard function returns nonzero. If there is no such bypass, then
1126 bypass without the guard function is chosen. */
1127 DEF_RTL_EXPR(DEFINE_BYPASS, "define_bypass", "issS", RTX_EXTRA)
1129 /* (define_automaton string) describes names of automata generated and
1130 used for pipeline hazards recognition. The names are separated by
1131 comma. Actually it is possibly to generate the single automaton
1132 but unfortunately it can be very large. If we use more one
1133 automata, the summary size of the automata usually is less than the
1134 single one. The automaton name is used in define_cpu_unit and
1135 define_query_cpu_unit. All automata should have unique names. */
1136 DEF_RTL_EXPR(DEFINE_AUTOMATON, "define_automaton", "s", RTX_EXTRA)
1138 /* (automata_option string) describes option for generation of
1139 automata. Currently there are the following options:
1141 o "no-minimization" which makes no minimization of automata. This
1142 is only worth to do when we are debugging the description and
1143 need to look more accurately at reservations of states.
1145 o "time" which means printing additional time statistics about
1146 generation of automata.
1148 o "v" which means generation of file describing the result
1149 automata. The file has suffix `.dfa' and can be used for the
1150 description verification and debugging.
1152 o "w" which means generation of warning instead of error for
1153 non-critical errors.
1155 o "ndfa" which makes nondeterministic finite state automata.
1157 o "progress" which means output of a progress bar showing how many
1158 states were generated so far for automaton being processed. */
1159 DEF_RTL_EXPR(AUTOMATA_OPTION, "automata_option", "s", RTX_EXTRA)
1161 /* (define_reservation string string) names reservation (the first
1162 string) of cpu functional units (the 2nd string). Sometimes unit
1163 reservations for different insns contain common parts. In such
1164 case, you can describe common part and use its name (the 1st
1165 parameter) in regular expression in define_insn_reservation. All
1166 define_reservations, define_cpu_units, and define_query_cpu_units
1167 should have unique names which may not be "nothing". */
1168 DEF_RTL_EXPR(DEFINE_RESERVATION, "define_reservation", "ss", RTX_EXTRA)
1170 /* (define_insn_reservation name default_latency condition regexpr)
1171 describes reservation of cpu functional units (the 3nd operand) for
1172 instruction which is selected by the condition (the 2nd parameter).
1173 The first parameter is used for output of debugging information.
1174 The reservations are described by a regular expression according
1175 the following syntax:
1177 regexp = regexp "," oneof
1180 oneof = oneof "|" allof
1183 allof = allof "+" repeat
1186 repeat = element "*" number
1189 element = cpu_function_unit_name
1195 1. "," is used for describing start of the next cycle in
1198 2. "|" is used for describing the reservation described by the
1199 first regular expression *or* the reservation described by the
1200 second regular expression *or* etc.
1202 3. "+" is used for describing the reservation described by the
1203 first regular expression *and* the reservation described by the
1204 second regular expression *and* etc.
1206 4. "*" is used for convenience and simply means sequence in
1207 which the regular expression are repeated NUMBER times with
1208 cycle advancing (see ",").
1210 5. cpu functional unit name which means its reservation.
1212 6. reservation name -- see define_reservation.
1214 7. string "nothing" means no units reservation. */
1216 DEF_RTL_EXPR(DEFINE_INSN_RESERVATION, "define_insn_reservation", "sies", RTX_EXTRA)
1218 /* Expressions used for insn attributes. */
1220 /* Definition of an insn attribute.
1221 1st operand: name of the attribute
1222 2nd operand: comma-separated list of possible attribute values
1223 3rd operand: expression for the default value of the attribute. */
1224 DEF_RTL_EXPR(DEFINE_ATTR, "define_attr", "sse", RTX_EXTRA)
1226 /* Definition of an insn attribute that uses an existing enumerated type.
1227 1st operand: name of the attribute
1228 2nd operand: the name of the enumerated type
1229 3rd operand: expression for the default value of the attribute. */
1230 DEF_RTL_EXPR(DEFINE_ENUM_ATTR, "define_enum_attr", "sse", RTX_EXTRA)
1232 /* Marker for the name of an attribute. */
1233 DEF_RTL_EXPR(ATTR, "attr", "s", RTX_EXTRA)
1235 /* For use in the last (optional) operand of DEFINE_INSN or DEFINE_PEEPHOLE and
1236 in DEFINE_ASM_INSN to specify an attribute to assign to insns matching that
1239 (set_attr "name" "value") is equivalent to
1240 (set (attr "name") (const_string "value")) */
1241 DEF_RTL_EXPR(SET_ATTR, "set_attr", "ss", RTX_EXTRA)
1243 /* In the last operand of DEFINE_INSN and DEFINE_PEEPHOLE, this can be used to
1244 specify that attribute values are to be assigned according to the
1245 alternative matched.
1247 The following three expressions are equivalent:
1249 (set (attr "att") (cond [(eq_attrq "alternative" "1") (const_string "a1")
1250 (eq_attrq "alternative" "2") (const_string "a2")]
1251 (const_string "a3")))
1252 (set_attr_alternative "att" [(const_string "a1") (const_string "a2")
1253 (const_string "a3")])
1254 (set_attr "att" "a1,a2,a3")
1256 DEF_RTL_EXPR(SET_ATTR_ALTERNATIVE, "set_attr_alternative", "sE", RTX_EXTRA)
1258 /* A conditional expression true if the value of the specified attribute of
1259 the current insn equals the specified value. The first operand is the
1260 attribute name and the second is the comparison value. */
1261 DEF_RTL_EXPR(EQ_ATTR, "eq_attr", "ss", RTX_EXTRA)
1263 /* A special case of the above representing a set of alternatives. The first
1264 operand is bitmap of the set, the second one is the default value. */
1265 DEF_RTL_EXPR(EQ_ATTR_ALT, "eq_attr_alt", "ii", RTX_EXTRA)
1267 /* A conditional expression which is true if the specified flag is
1268 true for the insn being scheduled in reorg.
1270 genattr.c defines the following flags which can be tested by
1271 (attr_flag "foo") expressions in eligible_for_delay.
1273 forward, backward, very_likely, likely, very_unlikely, and unlikely. */
1275 DEF_RTL_EXPR (ATTR_FLAG, "attr_flag", "s", RTX_EXTRA)
1277 /* General conditional. The first operand is a vector composed of pairs of
1278 expressions. The first element of each pair is evaluated, in turn.
1279 The value of the conditional is the second expression of the first pair
1280 whose first expression evaluates nonzero. If none of the expressions is
1281 true, the second operand will be used as the value of the conditional. */
1282 DEF_RTL_EXPR(COND, "cond", "Ee", RTX_EXTRA)
1284 #endif /* GENERATOR_FILE */
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